"CRPF constable Deep Kumar Tiwari, a native of Lucknow in Uttar Pradesh, was found hanging in his barrack in Dantewada district jail on late Wednesday night", Dantewada SP Narendra Khare told PTI.
Other inmates were sleeping when Tiwari hanged himself, he said.
Though the motive behind the constable taking the extreme step is being ascertained, police suspect he might have killed himself as he was "disturbed" with the fratricide incident.
Tiwari was arrested for gunning down his four colleagues at the Aranpur camp of 111 CRPF Battalion in Maoist-infested Dantewada district, around 500 kms from here, on December 25, 2012.